@article{upaunsupervisedpromptagentviatreebasedse,
  title = {UPA: Unsupervised Prompt Agent via Tree-Based Search and Selection},
  author = {Siran Peng and Weisong Zhao and Tianyu Fu and Chenxu Zhao and Tianshuo Zhang and Haoyuan Zhang and Xiangyu Zhu and Minghui Wu and Zhen Lei},
  year = {2026},
  eprint = {2601.23273},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2601.23273},
}